package com.jiawen.service.impl;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

public class CustomHandler extends SimpleChannelInboundHandler<HttpObject> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg)
            throws Exception {
        // 获取channel
        Channel channel = ctx.channel();
        if (msg instanceof HttpRequest) {
            // 显示客户端的远程地址
            System.out.println(channel.remoteAddress());
            // 定义发送的数据消息(注意中文乱码的问题,idea编辑器,或者注意右下角那个编码多切换几次)
            ByteBuf content = Unpooled.copiedBuffer("Hello netty", CharsetUtil.UTF_8);
            // 构建一个http response
            FullHttpResponse response =
                    new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,
                            HttpResponseStatus.OK,
                            content);
            // 为响应增加数据类型和长度
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
            // 把响应刷到客户端
            ctx.writeAndFlush(response);
        }
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        //idea 输入 soutm 可以快捷打印方法
        System.out.println("CustomHandler.channelRegistered 注册");
        super.channelRegistered(ctx);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.channelUnregistered 移除");
        super.channelUnregistered(ctx);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.channelActive 活跃");
        super.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.channelInactive 不活跃");
        super.channelInactive(ctx);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.channelReadComplete 读取完毕");
        super.channelReadComplete(ctx);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println("CustomHandler.userEventTriggered 用户事件触发");
        super.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.channelWritabilityChanged 可写更改");
        super.channelWritabilityChanged(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("CustomHandler.exceptionCaught 捕获到异常");
        super.exceptionCaught(ctx, cause);
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.handlerAdded 助手类添加");
        super.handlerAdded(ctx);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("CustomHandler.handlerRemoved 助手类移除");
        super.handlerRemoved(ctx);
    }

}
